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Author (up) Adams, J.
Title Some Further Experiments On The Relation Of Light To Growth Type Journal Article
Year 1925 Publication American Journal of Botany Abbreviated Journal American Journal of Botany
Volume 12 Issue 7 Pages 398-412
Keywords Plants
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Series Volume Series Issue Edition
ISSN 0002-9122 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number GFZ @ kyba @ Serial 2393
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Author (up) Adams, J.
Title Duration of Light and Growth Type Journal Article
Year 1924 Publication Annals of Botany Abbreviated Journal
Volume 38 Issue 151 Pages 509-523
Keywords Plants
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ISSN ISBN Medium
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Notes Approved no
Call Number GFZ @ kyba @ Serial 2391
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Author (up) Adams, J.
Title The Effect on Certain Plants of altering the Daily Period of Light Type Journal Article
Year 1923 Publication Annals of Botany Abbreviated Journal
Volume 37 Issue 145 Pages 75-94
Keywords Plants
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ISSN ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number GFZ @ kyba @ Serial 2406
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Author (up) Apostol, K.; Dumroese, R.K.; Pinto, J.R.; Davis, A.S.
Title Response of conifer species from three latitudinal populations to light spectra generated by light-emitting diodes and high-pressure sodium lamps Type Journal Article
Year 2015 Publication Canadian Journal of Forest Research Abbreviated Journal Can. J. For. Res.
Volume 45 Issue 12 Pages 1711-1719
Keywords plants
Abstract Light-emitting diode (LED) technology shows promise for supplementing photosynthetically active radiation (PAR) in forest nurseries because of the potential reduction in energy consumption and an ability to supply discrete wavelengths to optimize seedling growth. Our objective was to examine the effects of light spectra supplied by LED and traditional high-pressure sodium (HPS) lamps on growth and physiology of Pseudotsuga menziesii (Douglas-fir) and Picea engelmannii (Engelmann spruce) seedlings. We used three latitudinal sources for each species: British Columbia (BC), Idaho (ID), and New Mexico (NM). Container seedlings were grown for 17 weeks in the greenhouse under an 18-h photoperiod of ambient solar light supplemented with light delivered from HPS or LED. In general, seedlings grown under LED had significantly greater growth, gas exchange rates, and chlorophyll contents than those seedlings grown under HPS. The growth and physiological responses to supplemental lighting varied greatly among species and seed sources. Generally, LED-grown seedlings from BC had the greatest growth and tissue dry matter followed by ID and NM populations. Compared with HPS, the significant increase in seedling growth and concomitant energy savings with LED (29% energy consumption relative to HPS) demonstrates the promise of using LED as PAR supplemental lighting for container seedling production.
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Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0045-5067 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number LoNNe @ kyba @ Serial 1250
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Author (up) Arnott, J. T.
Title Growth Response of White and Englemann Spruce Seedlings to Extended Photoperiod Using Three Light Intensities Type Report
Year 1982 Publication Technical Report: Pacific Forestry Centre Abbreviated Journal
Volume Issue Pages
Keywords Plants
Abstract Four seedlots of white spruce (Picea glauca (Moench) Voss) and three of Engelmann spruce (Picea engelmannii Parry), covering a range of 10 degrees of latitude and a range of altitudes, were sown in BC/ CFS Styroblocks and grown in a heated greenhouse and an unheated shadehouse, using incandescent light to provide a 19-h photoperiod. Four intensities of lighting were used: 0, 100,200, and 400 Ix. A second experiment with the same seedlots was conducted in growth rooms that were programmed to evaluate the effect of low night temperature on seedling shoot growth when the photoperiod was extended to 19 h, using a light intensity of 200 Ix.

Shoot length of white and Engelmann spruce seedlings grown under an extended daylength of 100 Ix were significantly taller than the control (0 Ix). There were no significant differences in shoot length or weight among the three intensities of light used to extend the photoperiod for all seedlots except the southern latitude-low elevation population of Engelmann spruce. The more northern populations of white spruce and the high altitude populations of Engelmann spruce did not require light intensities higher than 100 Ix to maintain apical growth. Low night temperature (7°C) did produce significantly smaller seedlings than the warm night (1SoC) regime. However, terminal resting buds of seedlings grown under the cool night regime did not form any sooner than on those seedlings grown under warm nights.
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Notes Approved no
Call Number IDA @ intern @ Serial 2372
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